/[cvs]/eggdrop1.9/src/net.c
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Revision 1.36 - (show annotations) (download) (as text)
Wed Aug 8 13:45:48 2001 UTC (18 years, 2 months ago) by drummer
Branch: MAIN
Changes since 1.35: +39 -9 lines
File MIME type: text/x-chdr
byteorder problem

1 /*
2 * net.c -- handles:
3 * all raw network i/o
4 *
5 * $Id: net.c,v 1.35 2001/08/01 16:31:41 drummer Exp $
6 */
7 /*
8 * This is hereby released into the public domain.
9 * Robey Pointer, robey@netcom.com
10 */
11
12 #include <fcntl.h>
13 #include "main.h"
14 #include <limits.h>
15 #include <string.h>
16 #include <netdb.h>
17 #include <sys/socket.h>
18 #if HAVE_SYS_SELECT_H
19 # include <sys/select.h>
20 #endif
21 #include <netinet/in.h>
22 #include <arpa/inet.h> /* is this really necessary? */
23 #include <errno.h>
24 #if HAVE_UNISTD_H
25 # include <unistd.h>
26 #endif
27 #include <setjmp.h>
28
29 #include "adns/adns.h"
30
31 #if !HAVE_GETDTABLESIZE
32 # ifdef FD_SETSIZE
33 # define getdtablesize() FD_SETSIZE
34 # else
35 # define getdtablesize() 200
36 # endif
37 #endif
38
39 #ifndef IN6_IS_ADDR_V4MAPPED
40 # define IN6_IS_ADDR_V4MAPPED(a) \
41 ((((uint32_t *) (a))[0] == 0) && (((uint32_t *) (a))[1] == 0) && \
42 (((uint32_t *) (a))[2] == htonl (0xffff)))
43 #endif
44
45 extern struct dcc_t *dcc;
46 extern int backgrd, use_stderr, resolve_timeout, dcc_total;
47 extern unsigned long otraffic_irc_today, otraffic_bn_today,
48 otraffic_dcc_today, otraffic_filesys_today,
49 otraffic_trans_today, otraffic_unknown_today;
50 extern char natip[];
51
52 char hostname[121] = ""; /* Hostname can be specified in the config
53 file */
54 char myip[121] = ""; /* IP can be specified in the config file */
55 char myip6[121] = ""; /* IP6 can be specified in the config file */
56 char firewall[121] = ""; /* Socks server for firewall */
57 int firewallport = 1080; /* Default port of Sock4/5 firewalls */
58 char botuser[21] = "eggdrop"; /* Username of the user running the bot */
59 int dcc_sanitycheck = 0; /* We should do some sanity checking on dcc
60 connections. */
61 sock_list *socklist = NULL; /* Enough to be safe */
62 int MAXSOCKS = 0;
63 jmp_buf alarmret; /* Env buffer for alarm() returns */
64
65 adns_state ads;
66
67 /* Types of proxy */
68 #define PROXY_SOCKS 1
69 #define PROXY_SUN 2
70 #define PROXY_POST 3
71
72
73 /* I need an UNSIGNED long for dcc type stuff
74 */
75 IP my_atoul(char *s)
76 {
77 IP ret = 0;
78
79 while ((*s >= '0') && (*s <= '9')) {
80 ret *= 10;
81 ret += ((*s) - '0');
82 s++;
83 }
84 return ret;
85 }
86
87 /* Initialize the socklist
88 */
89 void init_net()
90 {
91 int i;
92
93 for (i = 0; i < MAXSOCKS; i++) {
94 socklist[i].flags = SOCK_UNUSED;
95 }
96
97 /* init ADNS */
98 i = adns_init(&ads, adns_if_noautosys, 0);
99 if (i)
100 fatal(adns_strerror(i), 0);
101 }
102
103 int expmem_net()
104 {
105 int i, tot = 0;
106
107 for (i = 0; i < MAXSOCKS; i++) {
108 if (!(socklist[i].flags & SOCK_UNUSED)) {
109 if (socklist[i].inbuf != NULL)
110 tot += strlen(socklist[i].inbuf) + 1;
111 if (socklist[i].outbuf != NULL)
112 tot += socklist[i].outbuflen;
113 }
114 }
115 return tot;
116 }
117
118 /* Get my ip number
119 */
120 IP getmyip()
121 {
122 struct hostent *hp;
123 char s[121];
124 IP ip;
125 struct in_addr *in;
126
127 /* Could be pre-defined */
128 if (myip[0]) {
129 if ((myip[strlen(myip) - 1] >= '0') && (myip[strlen(myip) - 1] <= '9'))
130 return (IP) inet_addr(myip);
131 }
132 /* Also could be pre-defined */
133 if (hostname[0])
134 hp = gethostbyname(hostname);
135 else {
136 gethostname(s, 120);
137 hp = gethostbyname(s);
138 }
139 if (hp == NULL)
140 fatal("Hostname self-lookup failed.", 0);
141 in = (struct in_addr *) (hp->h_addr_list[0]);
142 ip = (IP) (in->s_addr);
143 return ip;
144 }
145
146 #ifdef IPV6
147 struct in6_addr getmyip6()
148 {
149 struct in6_addr ip;
150
151 /* Could be pre-defined */
152 if (myip6[0])
153 egg_inet_pton(AF_INET6, myip6, &ip);
154 else {
155 /* get system's default IPv6 ip -- FIXME!! */
156 /* there is know way?! - drummer */
157 ip = in6addr_any;
158 }
159 return ip;
160 }
161
162 struct in6_addr ipv4to6(IP a)
163 {
164 struct in6_addr ip;
165 if (a == INADDR_ANY)
166 return in6addr_any;
167 else {
168 ((uint32_t *)&ip)[0] = 0;
169 ((uint32_t *)&ip)[1] = 0;
170 ((uint16_t *)&ip)[4] = 0;
171 ((uint16_t *)&ip)[5] = 0xffff;
172 ((uint32_t *)&ip)[3] = a;
173 }
174 return ip;
175 }
176
177 #endif
178
179 void neterror(char *s)
180 {
181 switch (errno) {
182 case EADDRINUSE:
183 strcpy(s, "Address already in use");
184 break;
185 case EADDRNOTAVAIL:
186 strcpy(s, "Address invalid on remote machine");
187 break;
188 case EAFNOSUPPORT:
189 strcpy(s, "Address family not supported");
190 break;
191 case EALREADY:
192 strcpy(s, "Socket already in use");
193 break;
194 case EBADF:
195 strcpy(s, "Socket descriptor is bad");
196 break;
197 case ECONNREFUSED:
198 strcpy(s, "Connection refused");
199 break;
200 case EFAULT:
201 strcpy(s, "Namespace segment violation");
202 break;
203 case EINPROGRESS:
204 strcpy(s, "Operation in progress");
205 break;
206 case EINTR:
207 strcpy(s, "Timeout");
208 break;
209 case EINVAL:
210 strcpy(s, "Invalid namespace");
211 break;
212 case EISCONN:
213 strcpy(s, "Socket already connected");
214 break;
215 case ENETUNREACH:
216 strcpy(s, "Network unreachable");
217 break;
218 case ENOTSOCK:
219 strcpy(s, "File descriptor, not a socket");
220 break;
221 case ETIMEDOUT:
222 strcpy(s, "Connection timed out");
223 break;
224 case ENOTCONN:
225 strcpy(s, "Socket is not connected");
226 break;
227 case EHOSTUNREACH:
228 strcpy(s, "Host is unreachable");
229 break;
230 case EPIPE:
231 strcpy(s, "Broken pipe");
232 break;
233 #ifdef ECONNRESET
234 case ECONNRESET:
235 strcpy(s, "Connection reset by peer");
236 break;
237 #endif
238 #ifdef EACCES
239 case EACCES:
240 strcpy(s, "Permission denied");
241 break;
242 #endif
243 case 0:
244 strcpy(s, "Error 0");
245 break;
246 default:
247 sprintf(s, "Unforseen error %d", errno);
248 break;
249 }
250 }
251
252 /* Sets/Unsets options for a specific socket.
253 *
254 * Returns: 0 - on success
255 * -1 - socket not found
256 * -2 - illegal operation
257 */
258 int sockoptions(int sock, int operation, int sock_options)
259 {
260 int i;
261
262 for (i = 0; i < MAXSOCKS; i++)
263 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
264 if (operation == EGG_OPTION_SET)
265 socklist[i].flags |= sock_options;
266 else if (operation == EGG_OPTION_UNSET)
267 socklist[i].flags &= ~sock_options;
268 else
269 return -2;
270 return 0;
271 }
272 return -1;
273 }
274
275 /* Return a free entry in the socket entry
276 */
277 int allocsock(int sock, int options)
278 {
279 int i;
280
281 for (i = 0; i < MAXSOCKS; i++) {
282 if (socklist[i].flags & SOCK_UNUSED) {
283 /* yay! there is table space */
284 socklist[i].inbuf = socklist[i].outbuf = NULL;
285 socklist[i].inbuflen = socklist[i].outbuflen = 0;
286 socklist[i].flags = options;
287 socklist[i].sock = sock;
288 return i;
289 }
290 }
291 fatal("Socket table is full!", 0);
292 return -1; /* Never reached */
293 }
294
295 /* Request a normal socket for i/o
296 */
297 void setsock(int sock, int options)
298 {
299 int i = allocsock(sock, options);
300 int parm;
301
302 if (((sock != STDOUT) || backgrd) &&
303 !(socklist[i].flags & SOCK_NONSOCK)) {
304 parm = 1;
305 setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
306
307 parm = 0;
308 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
309 }
310 if (options & SOCK_LISTEN) {
311 /* Tris says this lets us grab the same port again next time */
312 parm = 1;
313 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
314 }
315 /* Yay async i/o ! */
316 fcntl(sock, F_SETFL, O_NONBLOCK);
317 }
318
319 int getsock(int options)
320 {
321 #ifdef IPV6
322 int sock = socket(AF_INET6, SOCK_STREAM, 0);
323 #else
324 int sock = socket(AF_INET, SOCK_STREAM, 0);
325 #endif
326
327 if (sock >= 0)
328 setsock(sock, options);
329 else
330 putlog(LOG_MISC, "*", "Warning: Can't create new socket!");
331 return sock;
332 }
333
334 /* Done with a socket
335 */
336 void killsock(register int sock)
337 {
338 register int i;
339
340 /* Ignore invalid sockets. */
341 if (sock < 0)
342 return;
343 for (i = 0; i < MAXSOCKS; i++) {
344 if ((socklist[i].sock == sock) && !(socklist[i].flags & SOCK_UNUSED)) {
345 close(socklist[i].sock);
346 if (socklist[i].inbuf != NULL) {
347 nfree(socklist[i].inbuf);
348 socklist[i].inbuf = NULL;
349 }
350 if (socklist[i].outbuf != NULL) {
351 nfree(socklist[i].outbuf);
352 socklist[i].outbuf = NULL;
353 socklist[i].outbuflen = 0;
354 }
355 socklist[i].flags = SOCK_UNUSED;
356 return;
357 }
358 }
359 putlog(LOG_MISC, "*", "Attempt to kill un-allocated socket %d !!", sock);
360 }
361
362 /* Send connection request to proxy
363 */
364 static int proxy_connect(int sock, char *host, int port, int proxy)
365 {
366 unsigned char x[10];
367 struct hostent *hp;
368 char s[256];
369 int i;
370
371 /* socks proxy */
372 if (proxy == PROXY_SOCKS) {
373 /* numeric IP? */
374 if (host[strlen(host) - 1] >= '0' && host[strlen(host) - 1] <= '9') {
375 IP ip = ((IP) inet_addr(host)); /* drummer */
376 egg_memcpy(x, &ip, 4); /* Beige@Efnet */
377 } else {
378 /* no, must be host.domain */
379 if (!setjmp(alarmret)) {
380 alarm(resolve_timeout);
381 hp = gethostbyname(host);
382 alarm(0);
383 } else {
384 hp = NULL;
385 }
386 if (hp == NULL) {
387 killsock(sock);
388 return -2;
389 }
390 egg_memcpy(x, hp->h_addr, hp->h_length);
391 }
392 egg_snprintf(s, sizeof s, "\004\001%c%c%c%c%c%c%s", (port >> 8) % 256,
393 (port % 256), x[0], x[1], x[2], x[3], botuser);
394 tputs(sock, s, strlen(botuser) + 9); /* drummer */
395 } else if (proxy == PROXY_SUN) {
396 egg_snprintf(s, sizeof s, "CONNECT %s:%d HTTP/1.0\n\n", host, port);
397 fcntl(sock, F_SETFL, 0); /* azta jo qrva anyadat eggdrop! */
398 tputs(sock, s, strlen(s)); /* drummer */
399 fcntl(sock, F_SETFL, O_NONBLOCK);
400 } else if (proxy == PROXY_POST) {
401 egg_snprintf(s, sizeof s, "POST http://%s:%d HTTP/1.0\n\n", host, port);
402 fcntl(sock, F_SETFL, 0); /* azta jo qrva anyadat eggdrop! */
403 tputs(sock, s, strlen(s)); /* drummer */
404 fcntl(sock, F_SETFL, O_NONBLOCK);
405 }
406 if (proxy != PROXY_POST)
407 for (i = 0; i < MAXSOCKS; i++)
408 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
409 socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
410 return sock;
411 }
412
413 /* Starts a connection attempt to a socket
414 *
415 * If given a normal hostname, this will be resolved to the corresponding
416 * IP address first. PLEASE try to use the non-blocking dns functions
417 * instead and then call this function with the IP address to avoid blocking.
418 *
419 * returns <0 if connection refused:
420 * -1 neterror() type error
421 * -2 can't resolve hostname
422 */
423 int open_telnet_raw(int sock, char *server, int sport)
424 {
425 #ifdef IPV6
426 struct sockaddr_in6 name, vname;
427 #else
428 struct sockaddr_in name, vname;
429 #endif
430 struct hostent *hp;
431 char host[121];
432 int i, port;
433 volatile int proxy;
434
435 debug2("|NET| open_telnet_raw: %s %d", server, sport);
436
437 /* firewall? use socks */
438 if (firewall[0]) {
439 if (firewall[0] == '!') {
440 proxy = PROXY_SUN;
441 strcpy(host, &firewall[1]);
442 } else if (firewall[0] == '@') {
443 proxy = PROXY_POST;
444 strcpy(host, &firewall[1]);
445 } else {
446 proxy = PROXY_SOCKS;
447 strcpy(host, firewall);
448 }
449 port = firewallport;
450 } else {
451 proxy = 0;
452 strcpy(host, server);
453 port = sport;
454 }
455
456 egg_bzero((char *) &name, sizeof name);
457 #ifdef IPV6
458 name.sin6_family = AF_INET6;
459 name.sin6_port = htons(port);
460 #else
461 name.sin_family = AF_INET;
462 name.sin_port = htons(port);
463 #endif
464
465 if (!setjmp(alarmret)) {
466 char *p;
467 int type;
468
469 alarm(resolve_timeout);
470
471 if (!egg_strncasecmp("ipv6%", host, 5)) {
472 type = AF_INET6;
473 p = host + 5;
474 debug1("|NET| checking only AAAA record for %s", p);
475 } else if (!egg_strncasecmp("ipv4%", host, 5)) {
476 type = AF_INET;
477 p = host + 5;
478 debug1("|NET| checking only A record for %s", p);
479 } else {
480 type = AF_INET; /* af_preferred */
481 p = host;
482 }
483 alarm(resolve_timeout);
484 #ifndef IPV6
485 hp = gethostbyname(p);
486 #else
487 hp = gethostbyname2(p, type);
488 if (!hp && (p == host))
489 hp = gethostbyname2(p, (type == AF_INET6 ? AF_INET : AF_INET6));
490 #endif
491 alarm(0);
492 } else {
493 hp = NULL;
494 }
495 if (hp == NULL)
496 return -2;
497
498 #ifndef IPV6
499 egg_memcpy(&name.sin_addr, hp->h_addr, hp->h_length);
500 name.sin_family = hp->h_addrtype;
501 #else
502 if (hp->h_addrtype == AF_INET6)
503 egg_memcpy(&name.sin6_addr, hp->h_addr, hp->h_length);
504 else if (hp->h_addrtype == AF_INET)
505 name.sin6_addr = ipv4to6(*((unsigned int*) hp->h_addr));
506 else
507 return -123; /* panic :P */
508 name.sin6_family = AF_INET6;
509 #endif
510
511 egg_bzero((char *) &vname, sizeof vname);
512 #ifndef IPV6
513 vname.sin_family = AF_INET;
514 vname.sin_addr.s_addr = (myip[0] ? getmyip() : INADDR_ANY);
515 #else
516 vname.sin6_family = AF_INET6;
517 if (IN6_IS_ADDR_V4MAPPED(&name.sin6_addr))
518 vname.sin6_addr = ipv4to6(myip[0] ? getmyip() : INADDR_ANY);
519 else
520 vname.sin6_addr = (myip6[0] ? getmyip6() : in6addr_any);
521 #endif
522 if (bind(sock, (struct sockaddr *) &vname, sizeof vname) < 0)
523 return -1;
524
525 for (i = 0; i < MAXSOCKS; i++) {
526 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
527 socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
528 }
529 if (connect(sock, (struct sockaddr *) &name, (sizeof name)) < 0) {
530 if (errno == EINPROGRESS) {
531 /* Firewall? announce connect attempt to proxy */
532 if (firewall[0])
533 return proxy_connect(sock, server, sport, proxy);
534 return sock; /* async success! */
535 } else
536 return -1;
537 }
538 /* Synchronous? :/ */
539 if (firewall[0])
540 return proxy_connect(sock, server, sport, proxy);
541 return sock;
542 }
543
544 /* Ordinary non-binary connection attempt */
545 int open_telnet(char *server, int port)
546 {
547 int sock = getsock(0),
548 ret = open_telnet_raw(sock, server, port);
549
550 if (ret < 0)
551 killsock(sock);
552 return ret;
553 }
554
555 /* Returns a socket number for a listening socket that will accept any
556 * connection on a certain address -- port # is returned in port
557 * "" means on any address
558 */
559 int open_address_listen(char *addr, int *port)
560 {
561 int sock;
562 unsigned int addrlen;
563 #ifdef IPV6
564 struct sockaddr_in6 name;
565 #else
566 struct sockaddr_in name;
567 #endif
568
569 if (firewall[0]) {
570 /* FIXME: can't do listen port thru firewall yet */
571 putlog(LOG_MISC, "*", "!! Cant open a listen port (you are using a firewall)");
572 return -1;
573 }
574
575 sock = getsock(SOCK_LISTEN);
576 if (sock < 1)
577 return -1;
578
579 debug2("|NET| open_address_listen(\"%s\", %d)", addr, *port);
580
581 egg_bzero((char *) &name, sizeof name);
582 #ifdef IPV6
583 name.sin6_family = AF_INET6;
584 name.sin6_port = htons(*port); /* 0 = just assign us a port */
585 if (!addr[0])
586 name.sin6_addr = in6addr_any;
587 else if (!egg_inet_pton(AF_INET6, addr, &name.sin6_addr)) {
588 struct in_addr a4;
589 if (egg_inet_aton(addr, &a4))
590 name.sin6_addr = ipv4to6(a4.s_addr);
591 else
592 name.sin6_addr = in6addr_any;
593 }
594 #else
595 name.sin_family = AF_INET;
596 name.sin_port = htons(*port); /* 0 = just assign us a port */
597 if (addr[0])
598 egg_inet_aton(addr, &name.sin_addr);
599 else
600 name.sin_addr.s_addr = INADDR_ANY;
601 #endif
602 if (bind(sock, (struct sockaddr *) &name, sizeof name) < 0) {
603 killsock(sock);
604 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
605 return -2;
606 else
607 return -1;
608 }
609 /* what port are we on? */
610 addrlen = sizeof name;
611 if (getsockname(sock, (struct sockaddr *) &name, &addrlen) < 0) {
612 killsock(sock);
613 return -1;
614 }
615 #ifdef IPV6
616 *port = ntohs(name.sin6_port);
617 #else
618 *port = ntohs(name.sin_port);
619 #endif
620 if (listen(sock, 1) < 0) {
621 killsock(sock);
622 return -1;
623 }
624 return sock;
625 }
626
627 /* Returns a socket number for a listening socket that will accept any
628 * connection -- port # is returned in port
629 */
630 inline int open_listen(int *port, int af)
631 {
632 if (af == AF_INET)
633 return open_address_listen(myip, port);
634 #ifdef IPV6
635 else if (af == AF_INET6)
636 return open_address_listen(myip6, port);
637 #endif
638 else
639 return -1;
640 }
641
642 /* Given a network-style IP address, returns the hostname. The hostname
643 * will be in the "##.##.##.##" format if there was an error.
644 *
645 * NOTE: This function is depreciated. Try using the async dns approach
646 * instead.
647 */
648 char *hostnamefromip(unsigned long ip)
649 {
650 struct hostent *hp;
651 unsigned long addr = ip;
652 unsigned char *p;
653 static char s[UHOSTLEN];
654
655 if (!setjmp(alarmret)) {
656 alarm(resolve_timeout);
657 hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
658 alarm(0);
659 } else {
660 hp = NULL;
661 }
662 if (hp == NULL) {
663 p = (unsigned char *) &addr;
664 sprintf(s, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
665 return s;
666 }
667 strncpyz(s, hp->h_name, sizeof s);
668 return s;
669 }
670
671 /* Returns the given network byte order IP address in the
672 * dotted format - "##.##.##.##"
673 * (it's IPv4 only, and it's okey - drummer)
674 */
675 char *iptostr(IP ip)
676 {
677 struct in_addr a;
678
679 a.s_addr = ip;
680 return inet_ntoa(a);
681 }
682
683 char *getlocaladdr(int sock)
684 {
685 static char buf[ADDRLEN];
686 #ifdef IPV6
687 struct sockaddr_in6 sa;
688 #else
689 struct sockaddr_in sa;
690 #endif
691 int len = sizeof sa;
692
693 if (sock == -1) { /* assuming IPv4... */
694 sprintf(buf, "%lu", (unsigned long int)
695 ntohl(natip[0] ? inet_addr(natip) : getmyip()));
696 return buf;
697 }
698
699 if (getsockname(sock, (struct sockaddr*) &sa, &len) == -1) {
700 debug1("|NET| getsockname() failed for sock %d", sock);
701 return 0;
702 }
703 #ifdef IPV6
704 if (IN6_IS_ADDR_V4MAPPED(&sa.sin6_addr))
705 sprintf(buf, "%lu",
706 (unsigned long int) ntohl(((uint32_t *)&sa.sin6_addr)[3]));
707 else
708 egg_inet_ntop(AF_INET6, &(sa.sin6_addr), buf, sizeof buf);
709 #else
710 sprintf(buf, "%lu", (unsigned long int) ntohl(sa.sin_addr.s_addr));
711 #endif
712 return buf;
713 }
714
715 /* Short routine to answer a connect received on a socket made previously
716 * by open_listen ... returns hostname of the caller & the new socket
717 * does NOT dispose of old "public" socket!
718 */
719 int answer(int sock, char *caller, char *ip, unsigned short *port,
720 int binary)
721 {
722 int new_sock;
723 unsigned int addrlen;
724 #ifdef IPV6
725 struct sockaddr_in6 from;
726 #else
727 struct sockaddr_in from;
728 #endif
729
730 addrlen = sizeof from;
731 new_sock = accept(sock, (struct sockaddr *) &from, &addrlen);
732 if (new_sock < 0)
733 return -1;
734 if (ip != NULL) {
735 #ifdef IPV6
736 if (IN6_IS_ADDR_V4MAPPED(&from.sin6_addr))
737 egg_inet_ntop(AF_INET, &(((uint32_t *)&from.sin6_addr)[3]), ip, ADDRMAX);
738 else
739 egg_inet_ntop(AF_INET6, &(from.sin6_addr), ip, ADDRMAX);
740 #else
741 egg_inet_ntop(AF_INET, &(from.sin_addr.s_addr), ip, ADDRMAX);
742 #endif
743 /* This is now done asynchronously. We now only provide the IP address.
744 *
745 * strncpy(caller, hostnamefromip(*ip), 120);
746 */
747 strncpyz(caller, ip, 121);
748 }
749 if (port != NULL)
750 #ifdef IPV6
751 *port = ntohs(from.sin6_port);
752 #else
753 *port = ntohs(from.sin_port);
754 #endif
755 /* Set up all the normal socket crap */
756 setsock(new_sock, (binary ? SOCK_BINARY : 0));
757 return new_sock;
758 }
759
760 /* Like open_telnet, but uses server & port specifications of dcc
761 */
762 int open_telnet_dcc(int sock, char *server, char *port)
763 {
764 int p;
765 struct in_addr ia;
766
767 debug2("|NET| open_telnet_dcc: %s %s", server, port);
768 if (port != NULL)
769 p = atoi(port);
770 else
771 return -3;
772 if (server == NULL)
773 return -3;
774 /* fix the IPv4 IP format (ie: 167772161 -> 10.0.0.1) */
775 if (egg_inet_aton(server, &ia))
776 return open_telnet_raw(sock, inet_ntoa(ia), p);
777 else
778 return open_telnet_raw(sock, server, p);
779 }
780
781 void egg_dns_gotanswer(int status, adns_answer *aw, char *origname)
782 {
783 char name[UHOSTLEN];
784
785 if (!aw) {
786 debug0("|DNS| egg_dns_gotanswer: ANSWER IS NULL!");
787 return;
788 }
789 if (!origname) {
790 debug0("|DNS| egg_dns_gotanswer: origname is NULL!");
791 return;
792 }
793
794 debug2("|DNS| egg_dns_gotanswer: status=%d adns_answer=%x", status, (int)aw);
795 status = 0;
796 if ((aw->type == adns_r_addr)
797 #ifdef IPV6
798 || (aw->type == adns_r_addr6)
799 #endif
800 ) {
801 if ((aw->status == adns_s_ok) && (aw->nrrs > 0)) {
802 adns_rr_addr *rrp = aw->rrs.untyped;
803 if (rrp->addr.sa.sa_family == AF_INET) {
804 egg_inet_ntop(AF_INET, &(rrp->addr.inet.sin_addr), name, UHOSTLEN-1);
805 status = 1;
806 #ifdef IPV6
807 } else if (rrp->addr.sa.sa_family == AF_INET6) {
808 egg_inet_ntop(AF_INET6, &(rrp->addr.inet6.sin6_addr), name, UHOSTLEN-1);
809 status = 1;
810 #endif
811 }
812 #ifdef IPV6
813 } else if ((aw->type == adns_r_addr /* af_preferred */) &&
814 egg_strncasecmp(origname, "ipv6%", 5) &&
815 egg_strncasecmp(origname, "ipv4%", 5)) {
816 adns_query q6;
817 char *orign2 = (char*) nmalloc(strlen(origname) + 1);
818 strcpy(orign2, origname);
819 /* ...it may be AAAA */
820 debug1("|DNS| egg_dns_gotanswer: A failed, checking for AAAA (%s)", origname);
821 adns_submit(ads, origname, adns_r_addr6, 0, orign2, &q6);
822 status = -1;
823 #endif
824 }
825 if (status == 0)
826 strcpy(name, "0.0.0.0");
827 if (status >= 0) {
828 debug3("|DNS| egg_dns_gotanswer: (ipbyhost) host: %s ip: %s status: %d", origname, name, status);
829 call_ipbyhost(origname, name, status);
830 }
831 } else if ((aw->type == adns_r_ptr_ip6) || (aw->type == adns_r_ptr)) {
832 if ((aw->status == adns_s_ok) && (aw->nrrs > 0)) {
833 if (aw->rrs.str) {
834 strncpyz(name, *(aw->rrs.str), UHOSTLEN);
835 status = 1;
836 }
837 }
838 if (!status) {
839 if (origname)
840 strncpyz(name, origname, UHOSTLEN);
841 else
842 strcpy(name, "error");
843 }
844 debug3("|DNS| egg_dns_gotanswer: (hostbyip) ip: %s host: %s status: %d", origname, name, status);
845 call_hostbyip(origname, name, status);
846 } else
847 debug0("|DNS| egg_dns_gotanswer: got unknow type of answer ?!");
848 nfree(origname);
849 }
850
851 void egg_dns_checkall()
852 {
853 adns_query q, r;
854 adns_answer *answer;
855 char *origname;
856
857 adns_forallqueries_begin(ads);
858 while ((q = adns_forallqueries_next(ads, (void **)&r)) != NULL) {
859 switch (adns_check(ads, &q, &answer, (void **)&origname)) {
860 case 0: /* ok */
861 egg_dns_gotanswer(1, answer, origname);
862 break;
863 case EAGAIN: /* Go into the queue again */
864 break;
865 default: /* failed */
866 egg_dns_gotanswer(0, answer, origname);
867 break;
868 }
869 }
870 }
871
872 /* Attempts to read from all the sockets in socklist
873 * fills s with up to 511 bytes if available, and returns the array index
874 *
875 * on EOF: returns -1, with socket in len
876 * on socket error: returns -2
877 * if nothing is ready: returns -3
878 */
879 static int sockread(char *s, int *len)
880 {
881 fd_set fd, fdw, fde;
882 int fds, i, x;
883 struct timeval t, tnow;
884 struct timeval *pt = &t;
885 int grab = 511;
886
887 fds = getdtablesize();
888 #ifdef FD_SETSIZE
889 if (fds > FD_SETSIZE)
890 fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
891 #endif
892 /* timeout: 1 sec */
893 t.tv_sec = 1;
894 t.tv_usec = 0;
895 FD_ZERO(&fd);
896
897 for (i = 0; i < MAXSOCKS; i++)
898 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
899 if ((socklist[i].sock == STDOUT) && !backgrd)
900 FD_SET(STDIN, &fd);
901 else
902 FD_SET(socklist[i].sock, &fd);
903 }
904 tnow.tv_sec = time(NULL);
905 tnow.tv_usec = 0;
906 adns_beforeselect(ads, &fds, &fd, &fdw, &fde, &pt, 0, &tnow);
907 #ifdef HPUX_HACKS
908 #ifndef HPUX10_HACKS
909 x = select(fds, (int *) &fd, (int *) NULL, (int *) NULL, &t);
910 #else
911 x = select(fds, &fd, NULL, NULL, &t);
912 #endif
913 #else
914 x = select(fds, &fd, NULL, NULL, &t);
915 #endif
916 tnow.tv_sec = time(NULL);
917 tnow.tv_usec = 0;
918 adns_afterselect(ads, fds, &fd, &fdw, &fde, &tnow);
919
920 /* dns stuff */
921 egg_dns_checkall();
922
923 if (x > 0) {
924 /* Something happened */
925 for (i = 0; i < MAXSOCKS; i++) {
926 if ((!(socklist[i].flags & SOCK_UNUSED)) &&
927 ((FD_ISSET(socklist[i].sock, &fd)) ||
928 ((socklist[i].sock == STDOUT) && (!backgrd) &&
929 (FD_ISSET(STDIN, &fd))))) {
930 if (socklist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
931 /* Listening socket -- don't read, just return activity */
932 /* Same for connection attempt */
933 /* (for strong connections, require a read to succeed first) */
934 if (socklist[i].flags & SOCK_PROXYWAIT) { /* drummer */
935 /* Hang around to get the return code from proxy */
936 grab = 10;
937 } else if (!(socklist[i].flags & SOCK_STRONGCONN)) {
938 debug1("net: connect! sock %d", socklist[i].sock);
939 s[0] = 0;
940 *len = 0;
941 return i;
942 }
943 } else if (socklist[i].flags & SOCK_PASS) {
944 s[0] = 0;
945 *len = 0;
946 return i;
947 }
948 if ((socklist[i].sock == STDOUT) && !backgrd)
949 x = read(STDIN, s, grab);
950 else
951 x = read(socklist[i].sock, s, grab);
952 if (x <= 0) { /* eof */
953 if (errno == EAGAIN) {
954 s[0] = 0;
955 *len = 0;
956 return -3;
957 }
958 *len = socklist[i].sock;
959 socklist[i].flags &= ~SOCK_CONNECT;
960 debug1("net: eof!(read) socket %d", socklist[i].sock);
961 return -1;
962 }
963 s[x] = 0;
964 *len = x;
965 if (socklist[i].flags & SOCK_PROXYWAIT) {
966 debug2("net: socket: %d proxy errno: %d", socklist[i].sock, s[1]);
967 socklist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
968 switch (s[1]) {
969 case 84: /* HTTP/1.0 2 */
970 {
971 char c;
972 int cc = 0;
973 while (read(socklist[i].sock, &c, 1) > 0) {
974 if (c == 10) {
975 if (cc == 0)
976 cc++;
977 else
978 break;
979 } else if (c != 13) {
980 cc = 0;
981 }
982 }
983 }
984 s[0] = 0;
985 *len = 0;
986 return i;
987 case 90: /* Success */
988 s[0] = 0;
989 *len = 0;
990 return i;
991 case 91: /* Failed */
992 errno = ECONNREFUSED;
993 break;
994 case 92: /* No identd */
995 case 93: /* Identd said wrong username */
996 /* A better error message would be "socks misconfigured"
997 * or "identd not working" but this is simplest.
998 */
999 errno = ENETUNREACH;
1000 break;
1001 }
1002 *len = socklist[i].sock;
1003 return -1;
1004 }
1005 return i;
1006 }
1007 }
1008 } else if (x == -1)
1009 return -2; /* socket error */
1010 else {
1011 s[0] = 0;
1012 *len = 0;
1013 }
1014 return -3;
1015 }
1016
1017 /* sockgets: buffer and read from sockets
1018 *
1019 * Attempts to read from all registered sockets for up to one second. if
1020 * after one second, no complete data has been received from any of the
1021 * sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
1022 * if there is returnable data received from a socket, the data will be
1023 * in 's' (null-terminated if non-binary), the length will be returned
1024 * in len, and the socket number will be returned.
1025 * normal sockets have their input buffered, and each call to sockgets
1026 * will return one line terminated with a '\n'. binary sockets are not
1027 * buffered and return whatever coems in as soon as it arrives.
1028 * listening sockets will return an empty string when a connection comes in.
1029 * connecting sockets will return an empty string on a successful connect,
1030 * or EOF on a failed connect.
1031 * if an EOF is detected from any of the sockets, that socket number will be
1032 * put in len, and -1 will be returned.
1033 * the maximum length of the string returned is 512 (including null)
1034 *
1035 * Returns -4 if we handled something that shouldn't be handled by the
1036 * dcc functions. Simply ignore it.
1037 */
1038
1039 int sockgets(char *s, int *len)
1040 {
1041 char xx[514], *p, *px;
1042 int ret, i, data = 0;
1043
1044 for (i = 0; i < MAXSOCKS; i++) {
1045 /* Check for stored-up data waiting to be processed */
1046 if (!(socklist[i].flags & SOCK_UNUSED) &&
1047 !(socklist[i].flags & SOCK_BUFFER) && (socklist[i].inbuf != NULL)) {
1048 if (!(socklist[i].flags & SOCK_BINARY)) {
1049 /* look for \r too cos windows can't follow RFCs */
1050 p = strchr(socklist[i].inbuf, '\n');
1051 if (p == NULL)
1052 p = strchr(socklist[i].inbuf, '\r');
1053 if (p != NULL) {
1054 *p = 0;
1055 if (strlen(socklist[i].inbuf) > 510)
1056 socklist[i].inbuf[510] = 0;
1057 strcpy(s, socklist[i].inbuf);
1058 px = (char *) nmalloc(strlen(p + 1) + 1);
1059 strcpy(px, p + 1);
1060 nfree(socklist[i].inbuf);
1061 if (px[0])
1062 socklist[i].inbuf = px;
1063 else {
1064 nfree(px);
1065 socklist[i].inbuf = NULL;
1066 }
1067 /* Strip CR if this was CR/LF combo */
1068 if (s[strlen(s) - 1] == '\r')
1069 s[strlen(s) - 1] = 0;
1070 *len = strlen(s);
1071 return socklist[i].sock;
1072 }
1073 } else {
1074 /* Handling buffered binary data (must have been SOCK_BUFFER before). */
1075 if (socklist[i].inbuflen <= 510) {
1076 *len = socklist[i].inbuflen;
1077 egg_memcpy(s, socklist[i].inbuf, socklist[i].inbuflen);
1078 nfree(socklist[i].inbuf);
1079 socklist[i].inbuf = NULL;
1080 socklist[i].inbuflen = 0;
1081 } else {
1082 /* Split up into chunks of 510 bytes. */
1083 *len = 510;
1084 egg_memcpy(s, socklist[i].inbuf, *len);
1085 egg_memcpy(socklist[i].inbuf, socklist[i].inbuf + *len, *len);
1086 socklist[i].inbuflen -= *len;
1087 socklist[i].inbuf = nrealloc(socklist[i].inbuf,
1088 socklist[i].inbuflen);
1089 }
1090 return socklist[i].sock;
1091 }
1092 }
1093 /* Also check any sockets that might have EOF'd during write */
1094 if (!(socklist[i].flags & SOCK_UNUSED)
1095 && (socklist[i].flags & SOCK_EOFD)) {
1096 s[0] = 0;
1097 *len = socklist[i].sock;
1098 return -1;
1099 }
1100 }
1101 /* No pent-up data of any worth -- down to business */
1102 *len = 0;
1103 ret = sockread(xx, len);
1104 if (ret < 0) {
1105 s[0] = 0;
1106 return ret;
1107 }
1108 /* Binary, listening and passed on sockets don't get buffered. */
1109 if (socklist[ret].flags & SOCK_CONNECT) {
1110 if (socklist[ret].flags & SOCK_STRONGCONN) {
1111 socklist[ret].flags &= ~SOCK_STRONGCONN;
1112 /* Buffer any data that came in, for future read. */
1113 socklist[ret].inbuflen = *len;
1114 socklist[ret].inbuf = (char *) nmalloc(*len + 1);
1115 /* It might be binary data. You never know. */
1116 egg_memcpy(socklist[ret].inbuf, xx, *len);
1117 socklist[ret].inbuf[*len] = 0;
1118 }
1119 socklist[ret].flags &= ~SOCK_CONNECT;
1120 s[0] = 0;
1121 return socklist[ret].sock;
1122 }
1123 if (socklist[ret].flags & SOCK_BINARY) {
1124 egg_memcpy(s, xx, *len);
1125 return socklist[ret].sock;
1126 }
1127 if ((socklist[ret].flags & SOCK_LISTEN) ||
1128 (socklist[ret].flags & SOCK_PASS))
1129 return socklist[ret].sock;
1130 if (socklist[ret].flags & SOCK_BUFFER) {
1131 socklist[ret].inbuf = (char *) nrealloc(socklist[ret].inbuf,
1132 socklist[ret].inbuflen + *len + 1);
1133 egg_memcpy(socklist[ret].inbuf + socklist[ret].inbuflen, xx, *len);
1134 socklist[ret].inbuflen += *len;
1135 /* We don't know whether it's binary data. Make sure normal strings
1136 will be handled properly later on too. */
1137 socklist[ret].inbuf[socklist[ret].inbuflen] = 0;
1138 return -4; /* Ignore this one. */
1139 }
1140 /* Might be necessary to prepend stored-up data! */
1141 if (socklist[ret].inbuf != NULL) {
1142 p = socklist[ret].inbuf;
1143 socklist[ret].inbuf = (char *) nmalloc(strlen(p) + strlen(xx) + 1);
1144 strcpy(socklist[ret].inbuf, p);
1145 strcat(socklist[ret].inbuf, xx);
1146 nfree(p);
1147 if (strlen(socklist[ret].inbuf) < 512) {
1148 strcpy(xx, socklist[ret].inbuf);
1149 nfree(socklist[ret].inbuf);
1150 socklist[ret].inbuf = NULL;
1151 socklist[ret].inbuflen = 0;
1152 } else {
1153 p = socklist[ret].inbuf;
1154 socklist[ret].inbuflen = strlen(p) - 510;
1155 socklist[ret].inbuf = (char *) nmalloc(socklist[ret].inbuflen + 1);
1156 strcpy(socklist[ret].inbuf, p + 510);
1157 *(p + 510) = 0;
1158 strcpy(xx, p);
1159 nfree(p);
1160 /* (leave the rest to be post-pended later) */
1161 }
1162 }
1163 /* Look for EOL marker; if it's there, i have something to show */
1164 p = strchr(xx, '\n');
1165 if (p == NULL)
1166 p = strchr(xx, '\r');
1167 if (p != NULL) {
1168 *p = 0;
1169 strcpy(s, xx);
1170 strcpy(xx, p + 1);
1171 if (s[strlen(s) - 1] == '\r')
1172 s[strlen(s) - 1] = 0;
1173 data = 1; /* DCC_CHAT may now need to process a
1174 blank line */
1175 /* NO! */
1176 /* if (!s[0]) strcpy(s," "); */
1177 } else {
1178 s[0] = 0;
1179 if (strlen(xx) >= 510) {
1180 /* String is too long, so just insert fake \n */
1181 strcpy(s, xx);
1182 xx[0] = 0;
1183 data = 1;
1184 }
1185 }
1186 *len = strlen(s);
1187 /* Anything left that needs to be saved? */
1188 if (!xx[0]) {
1189 if (data)
1190 return socklist[ret].sock;
1191 else
1192 return -3;
1193 }
1194 /* Prepend old data back */
1195 if (socklist[ret].inbuf != NULL) {
1196 p = socklist[ret].inbuf;
1197 socklist[ret].inbuflen = strlen(p) + strlen(xx);
1198 socklist[ret].inbuf = (char *) nmalloc(socklist[ret].inbuflen + 1);
1199 strcpy(socklist[ret].inbuf, xx);
1200 strcat(socklist[ret].inbuf, p);
1201 nfree(p);
1202 } else {
1203 socklist[ret].inbuflen = strlen(xx);
1204 socklist[ret].inbuf = (char *) nmalloc(socklist[ret].inbuflen + 1);
1205 strcpy(socklist[ret].inbuf, xx);
1206 }
1207 if (data) {
1208 return socklist[ret].sock;
1209 } else {
1210 return -3;
1211 }
1212 }
1213
1214 /* Dump something to a socket
1215 *
1216 * NOTE: Do NOT put Contexts in here if you want DEBUG to be meaningful!!
1217 */
1218 void tputs(register int z, char *s, unsigned int len)
1219 {
1220 register int i, x, idx;
1221 char *p;
1222 static int inhere = 0;
1223
1224 if (z < 0)
1225 return; /* um... HELLO?! sanity check please! */
1226 if (((z == STDOUT) || (z == STDERR)) && (!backgrd || use_stderr)) {
1227 write(z, s, len);
1228 return;
1229 }
1230 for (i = 0; i < MAXSOCKS; i++) {
1231 if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == z)) {
1232 for (idx = 0; idx < dcc_total; idx++) {
1233 if (dcc[idx].sock == z) {
1234 if (dcc[idx].type) {
1235 if (dcc[idx].type->name) {
1236 if (!strncmp(dcc[idx].type->name, "BOT", 3)) {
1237 otraffic_bn_today += len;
1238 break;
1239 } else if (!strcmp(dcc[idx].type->name, "SERVER")) {
1240 otraffic_irc_today += len;
1241 break;
1242 } else if (!strncmp(dcc[idx].type->name, "CHAT", 4)) {
1243 otraffic_dcc_today += len;
1244 break;
1245 } else if (!strncmp(dcc[idx].type->name, "FILES", 5)) {
1246 otraffic_filesys_today += len;
1247 break;
1248 } else if (!strcmp(dcc[idx].type->name, "SEND")) {
1249 otraffic_trans_today += len;
1250 break;
1251 } else if (!strncmp(dcc[idx].type->name, "GET", 3)) {
1252 otraffic_trans_today += len;
1253 break;
1254 } else {
1255 otraffic_unknown_today += len;
1256 break;
1257 }
1258 }
1259 }
1260 }
1261 }
1262
1263 if ((socklist[i].outbuf != NULL) || (socklist[i].flags & SOCK_PROXYWAIT)) {
1264 /* Already queueing or waiting for proxy: just add it */
1265 p = (char *) nrealloc(socklist[i].outbuf, socklist[i].outbuflen + len);
1266 egg_memcpy(p + socklist[i].outbuflen, s, len);
1267 socklist[i].outbuf = p;
1268 socklist[i].outbuflen += len;
1269 return;
1270 }
1271 /* Try. */
1272 x = write(z, s, len);
1273 if (x == (-1))
1274 x = 0;
1275 if (x < len) {
1276 /* Socket is full, queue it */
1277 socklist[i].outbuf = (char *) nmalloc(len - x);
1278 egg_memcpy(socklist[i].outbuf, &s[x], len - x);
1279 socklist[i].outbuflen = len - x;
1280 }
1281 return;
1282 }
1283 }
1284 /* Make sure we don't cause a crash by looping here */
1285 if (!inhere) {
1286 inhere = 1;
1287
1288 putlog(LOG_MISC, "*", "!!! writing to nonexistent socket: %d", z);
1289 s[strlen(s) - 1] = 0;
1290 putlog(LOG_MISC, "*", "!-> '%s'", s);
1291
1292 inhere = 0;
1293 }
1294 }
1295
1296 /* tputs might queue data for sockets, let's dump as much of it as
1297 * possible.
1298 */
1299 void dequeue_sockets()
1300 {
1301 int i, x;
1302
1303 for (i = 0; i < MAXSOCKS; i++) {
1304 if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_PROXYWAIT)) &&
1305 socklist[i].outbuf != NULL) {
1306 /* Trick tputs into doing the work */
1307 x = write(socklist[i].sock, socklist[i].outbuf,
1308 socklist[i].outbuflen);
1309 if ((x < 0) && (errno != EAGAIN)
1310 #ifdef EBADSLT
1311 && (errno != EBADSLT)
1312 #endif
1313 #ifdef ENOTCONN
1314 && (errno != ENOTCONN)
1315 #endif
1316 ) {
1317 /* This detects an EOF during writing */
1318 debug3("net: eof!(write) socket %d (%s,%d)", socklist[i].sock,
1319 strerror(errno), errno);
1320 socklist[i].flags |= SOCK_EOFD;
1321 } else if (x == socklist[i].outbuflen) {
1322 /* If the whole buffer was sent, nuke it */
1323 nfree(socklist[i].outbuf);
1324 socklist[i].outbuf = NULL;
1325 socklist[i].outbuflen = 0;
1326 } else if (x > 0) {
1327 char *p = socklist[i].outbuf;
1328
1329 /* This removes any sent bytes from the beginning of the buffer */
1330 socklist[i].outbuf = (char *) nmalloc(socklist[i].outbuflen - x);
1331 egg_memcpy(socklist[i].outbuf, p + x, socklist[i].outbuflen - x);
1332 socklist[i].outbuflen -= x;
1333 nfree(p);
1334 }
1335
1336 /* All queued data was sent. Call handler if one exists and the
1337 * dcc entry wants it.
1338 */
1339 if (!socklist[i].outbuf) {
1340 int idx = findanyidx(socklist[i].sock);
1341
1342 if (idx > 0 && dcc[idx].type && dcc[idx].type->outdone)
1343 dcc[idx].type->outdone(idx);
1344 }
1345 }
1346 }
1347 }
1348
1349
1350 /*
1351 * Debugging stuff
1352 */
1353
1354 void tell_netdebug(int idx)
1355 {
1356 int i;
1357 char s[80];
1358
1359 dprintf(idx, "Open sockets:");
1360 for (i = 0; i < MAXSOCKS; i++) {
1361 if (!(socklist[i].flags & SOCK_UNUSED)) {
1362 sprintf(s, " %d", socklist[i].sock);
1363 if (socklist[i].flags & SOCK_BINARY)
1364 strcat(s, " (binary)");
1365 if (socklist[i].flags & SOCK_LISTEN)
1366 strcat(s, " (listen)");
1367 if (socklist[i].flags & SOCK_PASS)
1368 strcat(s, " (passed on)");
1369 if (socklist[i].flags & SOCK_CONNECT)
1370 strcat(s, " (connecting)");
1371 if (socklist[i].flags & SOCK_STRONGCONN)
1372 strcat(s, " (strong)");
1373 if (socklist[i].flags & SOCK_NONSOCK)
1374 strcat(s, " (file)");
1375 if (socklist[i].inbuf != NULL)
1376 sprintf(&s[strlen(s)], " (inbuf: %04X)", strlen(socklist[i].inbuf));
1377 if (socklist[i].outbuf != NULL)
1378 sprintf(&s[strlen(s)], " (outbuf: %06lX)", socklist[i].outbuflen);
1379 strcat(s, ",");
1380 dprintf(idx, "%s", s);
1381 }
1382 }
1383 dprintf(idx, " done.\n");
1384 }
1385
1386 /* Security-flavoured sanity checking on DCC connections of all sorts can be
1387 * done with this routine. Feed it the proper information from your DCC
1388 * before you attempt the connection, and this will make an attempt at
1389 * figuring out if the connection is really that person, or someone screwing
1390 * around. It's not foolproof, but anything that fails this check probably
1391 * isn't going to work anyway due to masquerading firewalls, NAT routers,
1392 * or bugs in mIRC.
1393 */
1394 int sanitycheck_dcc(char *nick, char *from, char *ipaddy, char *port)
1395 {
1396 /* According to the latest RFC, the clients SHOULD be able to handle
1397 * DNS names that are up to 255 characters long. This is not broken.
1398 */
1399 char badaddress[16];
1400 IP ip = my_atoul(ipaddy);
1401 int prt = atoi(port);
1402
1403 /* It is disabled HERE so we only have to check in *one* spot! */
1404 if (!dcc_sanitycheck)
1405 return 1;
1406 if (prt < 1) {
1407 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible port of %u!",
1408 nick, from, prt);
1409 return 0;
1410 }
1411 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1412 (ip >> 8) & 0xff, ip & 0xff);
1413 if (ip < (1 << 24)) {
1414 putlog(LOG_MISC, "*", "ALERT: (%s!%s) specified an impossible IP of %s!",
1415 nick, from, badaddress);
1416 return 0;
1417 }
1418 return 1;
1419 }
1420
1421 int hostsanitycheck_dcc(char *nick, char *from, IP ip, char *dnsname,
1422 char *prt)
1423 {
1424 /* According to the latest RFC, the clients SHOULD be able to handle
1425 * DNS names that are up to 255 characters long. This is not broken.
1426 */
1427 char hostn[256], badaddress[16];
1428
1429 /* It is disabled HERE so we only have to check in *one* spot! */
1430 if (!dcc_sanitycheck)
1431 return 1;
1432 sprintf(badaddress, "%u.%u.%u.%u", (ip >> 24) & 0xff, (ip >> 16) & 0xff,
1433 (ip >> 8) & 0xff, ip & 0xff);
1434 /* These should pad like crazy with zeros, since 120 bytes or so is
1435 * where the routines providing our data currently lose interest. I'm
1436 * using the n-variant in case someone changes that...
1437 */
1438 strncpyz(hostn, extracthostname(from), sizeof hostn);
1439 if (!egg_strcasecmp(hostn, dnsname)) {
1440 putlog(LOG_DEBUG, "*", "DNS information for submitted IP checks out.");
1441 return 1;
1442 }
1443 if (!strcmp(badaddress, dnsname))
1444 putlog(LOG_MISC, "*", "ALERT: (%s!%s) sent a DCC request with bogus IP "
1445 "information of %s port %s. %s does not resolve to %s!", nick, from,
1446 badaddress, prt, from, badaddress);
1447 else
1448 return 1; /* <- usually happens when we have
1449 a user with an unresolved hostmask! */
1450 return 0;
1451 }
1452
1453 /* Checks wether the referenced socket has data queued.
1454 *
1455 * Returns true if the incoming/outgoing (depending on 'type') queues
1456 * contain data, otherwise false.
1457 */
1458 int sock_has_data(int type, int sock)
1459 {
1460 int ret = 0, i;
1461
1462 for (i = 0; i < MAXSOCKS; i++)
1463 if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
1464 break;
1465 if (i < MAXSOCKS) {
1466 switch (type) {
1467 case SOCK_DATA_OUTGOING:
1468 ret = (socklist[i].outbuf != NULL);
1469 break;
1470 case SOCK_DATA_INCOMING:
1471 ret = (socklist[i].inbuf != NULL);
1472 break;
1473 }
1474 } else
1475 debug1("sock_has_data: could not find socket #%d, returning false.", sock);
1476 return ret;
1477 }
1478
1479 /* flush_inbuf():
1480 * checks if there's data in the incoming buffer of an connection
1481 * and flushs the buffer if possible
1482 *
1483 * returns: -1 if the dcc entry wasn't found
1484 * -2 if dcc[idx].type->activity doesn't exist and the data couldn't
1485 * be handled
1486 * 0 if buffer was empty
1487 * otherwise length of flushed buffer
1488 */
1489 int flush_inbuf(int idx)
1490 {
1491 int i, len;
1492 char *inbuf;
1493
1494 Assert((idx >= 0) && (idx < dcc_total));
1495 for (i = 0; i < MAXSOCKS; i++) {
1496 if ((dcc[idx].sock == socklist[i].sock)
1497 && !(socklist[i].flags & SOCK_UNUSED)) {
1498 len = socklist[i].inbuflen;
1499 if ((len > 0) && socklist[i].inbuf) {
1500 if (dcc[idx].type && dcc[idx].type->activity) {
1501 inbuf = socklist[i].inbuf;
1502 socklist[i].inbuf = NULL;
1503 dcc[idx].type->activity(idx, inbuf, len);
1504 nfree(inbuf);
1505 return len;
1506 } else
1507 return -2;
1508 } else
1509 return 0;
1510 }
1511 }
1512 return -1;
1513 }

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